text: /*
   * Copyright (C) 2019 Google Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  #include "core/cc/log.h"
  #include "core/cc/target.h"
  extern "C" {
  __attribute__((constructor)) void _layer_keep_alive_func__();
  }
  #if (TARGET_OS == GAPID_OS_WINDOWS) || (TARGET_OS == GAPID_OS_OSX)
  class keep_alive_struct {};
  #else
  #include <dlfcn.h>
  #include <cstdint>
  #include <cstdio>
  class keep_alive_struct {
   public:
    keep_alive_struct();
  };
  
  keep_alive_struct::keep_alive_struct() {
    Dl_info info;
    if (dladdr((void*)&_layer_keep_alive_func__, &info)) {
      dlopen(info.dli_fname, RTLD_NODELETE);
    }
  }
  #endif
  
  extern "C" {
  // _layer_keep_alive_func__ is marked __attribute__((constructor))
  // this means on .so open, it will be called. Once that happens,
  // we create a struct, which on Android and Linux, forces the layer
  // to never be unloaded. There is some global state in perfetto
  // producers that does not like being unloaded.
  void _layer_keep_alive_func__() {
    keep_alive_struct d;
    (void)d;
  }
  }
  